Typewriter and the like



May 14, 1929. Mc ARMISTEAD 1,712,724

'rvrmwa'rma AND was LIKE Filed Aug. 6, 1925 4 SheatsSheet 2 awuenfoz:

May 1929. H. M L. ARMISTEAD TYPHWRITER AND THE LIKE Filed Aug. 6, 1925 4 Sheets-Sheet 3 amounted;

May 14, 1929.

H. McL."ARMISTEAD Y'TYPEWRITER AND 'IH'fi LIKE Filed Aug. 6, 1925 4 Sheets-Sheet 4 'mamm Patented May 14, 1929.

UNITED STATES 1,712,724 PAi ore-ICE.

I-IUBERT MoIi. ARMISTJELAD, OF FHANCIESGO, GALTSIFORINIA, .ASSIGNOR TO IYLAN'I- FOLD IMPRESSIONS CORPORATION, 013 GARSOIQ' CITY, NEVADA, A GORPORATION OF NEVADA.

TYPEVJ'HITER AND THE LIKE.

Application filed. August 6, 1925.

This invent-ion relates to improvements in tyl'iewriters and similar type impression do vices, and more particularly has to do with an improved platen for such devices.

As is Well known in the operation of type Writer and the like, noise results from the striking of the type against the platen, and it has heretofore been proposed to dcaden the sound of the blows oi the type upon the platen by employing a sound deadening: coveringz over theouter face thereof. Aside from noise due to this cause. however, in the operation of type Writing machines and the like, I have found that considerable ot the noise results from the transmission to and registration upon the platen of sounds and noises arising from other operating partsor mechanism oi the machine.

An. object of the present invention is to eliminate or prevent noise in the operation of typeivriting machines and the like; to pro vide for the elimination, absorption or deadening; not only sound vibrations caused by the blows oi the type upon the platen. but also to prevent sound and noise that arises by interaction, interiusion, intercommunication, echo or reverberations "from other asso- Jiated operating mechanism ot the machine, from being conveyeo to and registered upon the platen as Well as to prevent such. noises being dissei'ninated back through the parts oi the machine.

Another object of the invention is to provide an improved platen possessing; the char acteristics referred to and which at the same time will afford the maximum of efficient type impact area regards the length thereof.

A, further obj cct ot the invention is to provide an improved platen constructed and arranged to accomplish the purposes mentioned, and which will be of a simple, practicalhserviceable and inexpensive nature.

Theinvention, with other objects and advantages thereof, and the particular construction, combinations and arrangements of parts comprising the same, Will be understood from the hereinafter contained detail description when considered. in connection with the ac eoinpanying drawings, forming part hereot and illustrating one embodiment of the invention.

In the drawings:

Figure 1 is a top plan view of a portion of a typewriting machine equipped \vitha Serial No. 48,580.

"ten constructed in zuceordancewith the .t invention.

g. 9. a longitudinal section of the platen "with parts shown in elevation.

Fig.1. 3 is a longitudinal section of the platen, with certain of the parts removed.

ll 1 1 41 is a transverse sectlon on the line 4 l ot Fig. 2.

Fig. 5 is detail. perspective of one of the end heads of the platen.

l 1g. 6 1s a. detail perspective 0t an end port on ofthe main outer shell member of the platen.

h1g1. 7 1s av detail section oi one 01' the sound insulating members prior to its introduction between. one of the end heads and one end portion of the platen. V

8 is a detail longitudinal section of the sound insult -ing nember illustrated Fig. introduction in place between one 6, after its oi: the end heads and the main shell member or the platen.

Fin. 9 anelcvation of a section of the insulating means between the main shell member oi the platen and the outer impact thereof.

The invention comprehends an improved platen ineiudin a type impact member and supporting; means therefor, said platen hav- 111g; means for preventing or absorbing or deadening sound vibrations caused by the impact of the type against its impact member and being so constructed as to be entirely tree trom sound conducting parts in contact. Whilea specific embodiment of the invention is illustrated in the drawings, it will of course he undei tood that changes and obvious modifications mhy be made in the particular construction of platen shown, and the invention embodied in other forms and applied to the various kinds of analogous type iunprossion machines, as Will appeal to those skilled in the art and falling Within the scope of the appended claims, Without departing from the spirit of thcinvention.

In Figure 1 of the drawings is shown, in a gene 'al Way, a conventional form of typewriter provided With a platen constructed in accordance With the present invention, only such portion of the typewriter structure being illustrated as will be sufficient to a clear iuiderstanding oi the application thereto of lllYilDl'flOVtKl platen. 1 designates the main frame of the machine, 2 the keys, 3 the inking ribbon, l the ribbon spools, 6 the index pointer and the paper guide apron, the ime proved platen being designated as a whole, in this view, by the numeral 7. 7

7 1925, Serial No. 32,90-l, and'in which, the

7 one end.

extends into the chamber 19 a-nd has fingers platen hasintimately incorporated therewith aplurality of pairs of auxiliary ribbon carrying arms adapted to be swung to carry their ribbons downto a line of impact in front of the platen, and moved upwardly to a position above and'rearwardly of the platen.

Referring to a detail description of-the particular embodiment of the invention illustrated in thedrawings, and reference being bad particularly to Figures 2, 3, and 4; thereof, 8 designates the central supporting and operating shaft of the platen rotatably and lineally slidably mounted in journals 9 on end frame members 10 of a platen carriage, said shaft having at either end turning knobs 11. shouldered between the opposing inner ends of the ournals 9 are fixed casings 12, which are connected by a tubular member 13. Mounted for independent rotation about the platen shaft 8 within the tubular member 13 is an assemblage of nested sleeves 14, the end of said sleeves projecting into the easings 12, and each having a crank arm 15 provided with a. tail piece 16, each of the tail pieces being provided with a stud 17 which plays in and through arslot 18 in a chamber 19 of .one of the c: sings 12. Upon the platen shaft 8 is mounted for independent rotation a prime operating member in the form of a sleeve 20, having an operating knob 21 at The other end of the sleeve 20 22 adaptedto act upon the studs 17 and turn the crank arms 15, which in turn move the pairs of ribbon carrying arms 23. The ribbon carrying arms 23 arepivotally mounted at their inner ends at'2 l to and within the casings 12, the latter'being provided with peripheral guide slots 25 through which are entered said arms. The ribbon carrying arms 23 are each provided with a slot 26 and are slidably connected with the crank arms 15 by pins 27 on the crank arms 15 engaging said slots. I i 7 At the-ends of the platen 7 in Figure 2 of the drawings, is illustrated mechanism providing for the rotation of the platen by the shaft 8; detail mechanism for the contion of the detailed description of said parts and mechanism in this application is not necessary to a complete umlcrstandmg of the present invention.

Referring now to Figure 3 of the drawings, the platen proper comprises a tubular impact member and end heads 27. which are constructcl of metal or other suitable malerial, the platen being mounted for rotation by having its end heads 27 journaled upon flanges 28 of the fixed casings 12. The tubular impact member is made up of a foun dation or main tubular member or shell 29 constructed of metal or other suitable material, sound deadening or insulating covering or cylinder 30 of felt upon the outer face of the main tubular member 29, and an outer covering or sheath 31 of rubber constituting the working face of the platen, the intermediate sound deadening or covering 30 completely separating and forming cilicicnt sound deadening means between the outer rubber covering 31 and the main tubular member 29. The sound deadening or insulating covering 30 and the outer covering or sheath 31, which, as will be undcrstmd, are tightly secured one upon the other upon the outer face of the main tubular member 29, may be formed and secured upon the outer face of the main tubular member 29 in any suitable way. In the particular construction shown, sec Figure 9 of the drawings, the intern'iediale sound deadening covering or cylinder 30 is formed by :1 st rip of felt wound spirally upon the main tubular member 29,

and the main tubular member 29 is provided with a roughened outer face 32 by scoring or the like to assist in securing the felt covering 30 in place.

The end heads 27 of the platen each comprise an outer peripheral portion 33, a radially extending portion 34, and an inner portion 35, the inner portion 35 of the end head 27 located at the left end of the platen extcndin g inwardly while the end portion 35 of the other end head is coextensive with its outer peripheral portion 33, said inner portions 35 of the end heads 27 rotatably engaging the flanges 28 of the fixed casings 12.

Means is provided for completely separating the supporting end heads 27 of the platen from its impact member by a sound deadening or insulating medium while at the same time connecting the impact member to the end heads 27 for rotation therewith. The means for this purpose comprises sound deadening or insulating collars or ring members of felt or other sound insulating material suitable for the purpose, the insulating collars or like members each having a peripheral portion 37 and a radially extending portion 38. maln tubular member 29 of the type impact member, at either end, is provided with an interiorani'mlar recess 39, said recesses having the peripheral wall portions 40 and end wall portions or shoulders 41. The walls 40 and a1 01'' the rec 39, and the peripheral portions 33 or" the end heads 27 are provided with roughened outer tacos by scoring or the like, as shown. The exterior diameter of the end heads 27 is less than the interior diameter of the annular recesses 39 of the main tubular member 29, and the parts are assembled, as shown, with the peripheral portions 37 of the insulating collars or like members in tight inter-fitting engagement with and between the roughened outer faces of the peripheral portions of the end heads 27 and the end portions of the main tubular member 29, the radially extending portions 33 of the end heads 27 being pressed against the radially extending portions 37 of the insulating collars or ring members, and the latter pressed against the roughened faces of the end walls eh) and shoulders 41. ot' the recesses 39, the construction and arrangement of parts being such that the sound insulating collars or ring members completely separate the end heads from contact With the main tubular member 29, and these parts are coupled to rotate together. The supporting end head 27 at the left of the platen has an internal gear 42 fixed thereto, rotary movement being transmitted to the platen through the countershatt 4:3 and the pinion 44 meshing with the internal gear 42 on said end head.

In practicing the invention the insulating collars or ring members may be constructed in fiat asher like form as illustrated Figure 7 ol the drawiu and the p arts assembled by placii'ipthe insulating collars or ring members 37, 38, in this fiat- :tormation, against the inner side of the end heads 27 and then forcing the end heads 27 and the insulating collars 37, 38 home within the ends of the main tubular member 29, the collars 37, 38 being pressed into the recess s 39 in tight fitting engagement with the v "alls and shoulders thereof and with the end heads 27.

The platen. i provided with sound deadening or insulatingmeans completely filling the space between the tubular member or sleeve 13, the inner sides of theen d heads 2! and the main tubular member 29 oi? the platen. This sound deadening filling is shown as con sisting of a plurality of rings or centrally apertured cylindrical sections 46 of felt or the likearranged end to end in close formation, as shown, said rings or cylindrical sections fitting closely about and slidably engaging the sleeve 13.

ld hile the sound insulating or deadening means oi the platen has been specifically referred to as formed of felt, it will be under- The stood that said insulating means including the lnsulatusig covering 30, the sound deadening or insulating filling 46, and the insulata ing collars or ring members 37, 38, may be constructed of any other suitable or equiv alent material having similar sound insulating ordeadening qualities, for instance, Java floss, among; other insulating materials that may be employed instead of felt.

It will be noted that by the invention an im-- platen, at the same time the improved construction afiords the fullest extent of type impact area for its length, pern'iittingr the use of the total length of platen, i1 cluding the width of the siuaporting end heads, and is of a practical, ellicient, serviceable, inexpens vc nature.

Wh at I claim is:

1. In a platen for typewriters and the like, and in combination, an outer type impact member, a separate rigid hollow shell or core member and end supports, members composed of sound insulating nmterial interposed between and a1itomatically connecting the rigid shell or core members and end supports for rotation together, and a shaft extending throiurh and beyond the shell or core memb a tor engagement with auisociated typewriter mechanism, and a sound insulating or nonducting medium arranged within the shell or core member to prevent the echo or reverberation of soruul or noise occurring within th shell or core member from being transmitted to the shell or core member.

2 In a platen tor typewriters and the like, a type impact member, rotatable end supports for the type impact member, and sound insulating or non-conducting means separat ii the type impact member from contact and sound conduction with the rotatable end supports, and interfitting therewitl'i to automatically connect tl a same for rotation together. 3. In a platen for typewriters or the like, a rule tubular type impact member, rotatable end supports for the platen comprising members having; outer annular. peripheral por tions adapted to be arranged within the ends of the platen, and members of sound insulating or non-conducting material separating the peripheral portions of the end supports from contact with the impact member and wholly tightly automatically interfitting all the ends of the tubular member therewith to constitute permanent means for connecting the same for rotation together.

4. In a platen for typewriters or the like, a tubular member having at its ends interior roughened face portions, rotatab e end supports for the platen havingv annular peripheral portions adapted tobe arranged within and provided and annular non-eond netwith outer roughened faces, members of sound insulating or 'ing material tightly fitting between the roughened end ,face portions of the tubular member and the roughened face of the annular peripheral portions of the rotatable end supports, said annular nembers separating the tubular member from contact with the end supports and constituting meat s connecting the same for rotation together;

i In'typewritcrs and similar motion tr smitting mechanisms, a coupling comprising a rotatable member ha mg a recess extendms! inwardly from one end thereof, the wall of said recess having a roughened face port; a rotatable coactmg member having an annular peripheral portion adante'dto be arranged within the recess of the first mentioned member in spaced relation with tl e walls of the recess and provided with an outer roughened face, and an annular member of sound insulating or non-conducting material tightly titting between the roughened face portion of the wall of said recess and the roughened face of said annular peripheral portion, said annular member separating the said members from contact and constituting means connecting' the samefor rotation together.

6. A platen for typewriters and the like,

including a rigid hollow core member, and

1 associated end support member, one of said membersextending within the other to support the same, and sound insulating means wholly interposed between the hollow core member and the end support, said sound insulating means separating the hollow core member and the end support from contact and sound comluetion with each other, and

iutertitting therewith to automatically connect the same for rotation together.

8. In a platen for typewriters and the like, including a type impact member. a single inncr shell or core member, and end supports, a sound insulating medium wholly separating the outer type impact member and the rigid inner shell. from sound conduction with each other, and members C(lllllXlSOd solely of a sound insulating or non-conducting element completely separating the inner shell and end supports from sound conduction with each other and automatically connecting the same for permanent rotation together.

9. In a typewriting machine or the like, a platen including a type impact member, a rotatable support therefor, sound insulating or non-conducting li'lOElllS completely separating the type impact member and the rotatable support from sound conduction with each other and wholly intertitting automatically therewith to constitute permanent means for connecting the same together, and associated mechanism including means for rotating the platen connected with the rotatable support of the platen.

10. In a platen for typewriters and the like, a type impact member, rotatable end supports for the type impact member, and annular members of felt separating the type impact member from contact and sound conduction wit-h the rotatable end supports and interfitt-ing therewith to automatically connect the same for rotation together, said annular members constituting the sole means of connection between the type impact member and the end supports.

11. In a platen for typewriters and the like, a type impact member, rotatable end supporting member therefor, one of said members extending within the other, said members being adapted for contactual coherence and concentric rotation, and a sound insulating element interposed between and of a character for contactual coherence with and to exert permanent intern'iediate pressure on said members, said pressural coherency constituting auton'iatie means providing for permanent concentric rotation of said members.

signature.

HUBERT MoL. ARMISTEAD. 

